I have used all three Diskeeper, PerfectDisk, and O&O Defrag.
I didn't use Diskeeper much but I didn't like it because there was no way to optimize the defrag. (arrange the files in a certain way to increase access time).
I also didn't like the way that even after defragging several times the files appeared to still be "spread out". (didn't consolidate the free space very well).
I used O&O version 4 for quite a while and really liked it.
It was damm slow but seemed to do quite a good job, it could take up to an hour per gig for a complete optimization the first few times but I would start it up before going to bed. I tried the new version 6 and it was much faster but unless I'm stupid I couldn't find a way to do an offline defrag of locked files unless I scheduled a defrag job.
I recently started using perfect disk a couple weeks ago and I really like it.
It's very fast, optimizes the files by access date, and does a very good job of consolidating the free space. (seems to me that without all the "holes" the drive shouldn't fragment as quick).
It seems to be working very well so far.
Dave
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